Method of controlling printing positions in a printer and an app

Details Method of controlling printing positions in a printer and an app Method of controlling printing positions in a printer and an app

1988-10-03

1989-09-26

Sewell, Paul T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400121, 400279, 400322, B41J 312

Patent

active

048696099

ABSTRACT:
Upon supply of electric power to a printer, a dot pulse is generated from a dot pulse generator each time a carriage driving motor rotates for a predetermined rotational angle, and thereafter, an output of a home position sensor falls when a carriage reaches its reference moving position. When a microprocessor determines that the leading edge of a dot pulse, generated for the first time after the generation of the trailing edge of the sensor output, is undetectable due to the presence of a closed timing relationship between the trailing edge of the sensor output and the leading edge of the dot pulse, on the basis of one period of the pulse generator output and a time period from an instant at which the trailing edge of the sensor output is generated to an instant at which the leading edge is detected, the microprocessor supplies a high level signal to an exclusive OR circuit, connected to the pulse generator, so as to invert the polarity of the detection edge of the dot pulses, to thereby prevent the closed timing relationship so as to prevent the leading edge of the dot pulse from being undetected, whereby a variation in printing positions is reduced.

REFERENCES:
patent: 4208137 (1980-06-01), Liu
patent: 4284362 (1981-08-01), Jackson
patent: 4343012 (1982-08-01), Knapp
patent: 4603984 (1986-08-01), Ullenboom
patent: 4710653 (1987-12-01), Yee

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